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CVE-2025-71389— Cal.com before 5.9.9 Remote Code Execution via RSC

Quick assessment

Affected
calcom cal.diy
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

calcom cal.diy是calcom的Web中间件。 calcom cal.diy 5.9.9之前版本存在代码注入漏洞，该漏洞源于捆绑的Next.js版本中React Server Components (RSC)请求处理反序列化攻击者控制的输入，可能导致未经身份验证的远程攻击者发送特制RSC请求，在服务端处理过程中执行任意代码。

CVSS 10.0 · Critical EPSS 1.35% · P71

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
calcom cal.diy < 5.9.9 affected
5.9.9 unaffected
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I. Basic Information for CVE-2025-71389

Vulnerability Information
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Vulnerability Title
Cal.com before 5.9.9 Remote Code Execution via RSC
Source: CVE Program / CVE List V5
Vulnerability Description
Cal.com (calcom/cal.diy) before 5.9.9 is vulnerable to unauthenticated remote code execution because it bundles a version of Next.js whose React Server Components (RSC) request handling deserializes attacker-controlled input. A remote attacker can send a crafted RSC request to the server and cause arbitrary code to be executed during server-side processing, without authentication or user interaction. The flaw derives from the upstream Next.js vulnerability CVE-2025-55182 and is resolved in 5.9.9 by updating the affected dependency.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5
Vulnerability Title
calcom cal.diy 代码注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
calcom cal.diy是calcom的Web中间件。 calcom cal.diy 5.9.9之前版本存在代码注入漏洞，该漏洞源于捆绑的Next.js版本中React Server Components (RSC)请求处理反序列化攻击者控制的输入，可能导致未经身份验证的远程攻击者发送特制RSC请求，在服务端处理过程中执行任意代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
calcom cal.diy 0 ~ 5.9.9 -

II. Public POCs for CVE-2025-71389

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III. Intelligence Information for CVE-2025-71389

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Patches & Fixes for CVE-2025-71389 (1)

Vendor Advisories for CVE-2025-71389 (3)

Same Patch Batch · calcom · 2026-07-23 · 4 CVEs total

CVE-2024-58354 9.9 CRITICAL cal.com Repository Takeover via pull_request_target Workflow
CVE-2024-58355 8.9 HIGH Cal.com through 4.7.15 Cross-Site Scripting via booking questions
CVE-2024-58353 8.9 HIGH Cal.com through 4.7.15 Cross-Site Scripting via booking questions

IV. Related Vulnerabilities

Same product: cal.diy
Same vendor: calcom
Same weakness: CWE-94

V. Comments for CVE-2025-71389

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